Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
hanh trinh » canh tranh, hanh chinh
cua truong » cua trung, xuan truong, cac truong
trinh cua » tinh cua, trinh luat, trinh quan
hieu luc » hieu luat
cong san » cong tac
tan tap » toan tap, tan tat, man tap
han tap » han tai, toan tap, nhan tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu luc) or (hieu qua)) - hanh trinh cua truong cong san ((tan tap) or (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu luc) OR (hieu qua)) - hanh trinh cua truong cong san ((tan tap) OR (han tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu luc) or (hieu qua)) - hanh trinh cua truong cong san ((tan tap) or (han tap))*.